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F5 F5CAB3 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Apply procedural concepts required to modify and manage virtual servers: This domain covers managing virtual servers including applying persistence, encryption, and protocol profiles, identifying iApp objects, reporting iRules, and showing pool configurations.
トピック 2	Apply procedural concepts required to modify and manage pools: This domain addresses managing server pools including health monitors, load balancing methods, priority groups, and service port configurations.

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F5 BIG-IP Administration Data Plane Configuration 認定 F5CAB3 試験問題 (Q47-Q52):

質問 # 47
A BIG-IP Administrator configures an SSH pool with five members.
Which health monitor should be applied?

A. HTTP
B. TCP
C. UDP
D. HTTPS

正解：B

解説：
SSH is a TCP-based service. A TCP monitor validates service availability without requiring application-layer inspection.

質問 # 48
A configuration change is made on the standby member of a device group. What is displayed as
"Recommended Action" on the Device Management Overview screen?

A. Force active member of device group to standby
B. Synchronize the active member configuration to the group
C. Synchronize the standby member configuration to the group
D. Activate device with the most recent configuration

正解：C

解説：
The BIG-IP system uses a centralized management framework to ensure that all devices within a Sync- Failover group share a consistent configuration. When an administrator makes a change on any member of the group-whether it is the active or the standby device-the system detects a "ConfigSync" mismatch. The
"Device Management >> Overview" screen tracks these changes by comparing the commit ID and timestamps of the configurations across all peers.
If a change is made on the standby member, that device now possesses a more recent configuration than the other members of the group. Consequently, the BIG-IP GUI will display a status of "Changes Pending" and suggest a Recommended Action to resolve the discrepancy. In this scenario, the correct action is to Synchronize the standby member configuration to the group. This push operation will copy the updated configuration from the standby device to the active device (and any other peers), bringing the entire cluster back into a "In Sync" status. It is important to note that BIG-IP allows bi-directional synchronization; you do not have to be on the active device to push a configuration. However, administrators must be cautious:
choosing Option C (Synchronizing the active member to the group) would overwrite the changes just made on the standby device with the older configuration from the active device, effectively reverting the changes. The Recommended Action always points toward the direction that propagates the most recent change to the rest of the group.

質問 # 49
Which Virtual Server type prevents the use of a default pool?

A. Standard
B. Performance (Layer 4)
C. Forwarding (IP)
D. Performance (HTTP)

正解：C

解説：
Forwarding (IP) virtual servers forward traffic based on routing decisions and do not use pools or pool members.

質問 # 50
Refer to the exhibit.

A BIG-IP Administrator configures a new VLAN on an HA pair of devices that does NOT yet have any traffic. This action causes the assigned traffic group to fail over to the standby device. Which VLAN setting should be changed to prevent this issue?

A. Fail-safe
B. Source Check
C. Auto Last Hop
D. Customer Tag

正解：A

解説：
The exhibit shows the advanced configuration of a VLAN where the Fail-safe option is checked. VLAN Fail- safe is a high-availability feature used to monitor network connectivity on a specific VLAN. When enabled, the BIG-IP system monitors the VLAN for network traffic. If the system does not detect any "useful" traffic on the VLAN within the specified Fail-safe Timeout (which is 90 seconds in the exhibit), it attempts to generate traffic by pinging the default gateway or other devices. If it still detects no traffic, the BIG-IP concludes that the VLAN is unreachable or the network interface has failed, and it triggers a "Fail-safe Action"-in this case, "Reboot" or a failover to the peer device in the HA group.
Because the administrator has just created a new VLAN that "does NOT yet have any traffic," the Fail-safe mechanism triggers immediately after the 90-second timeout period. Since no devices are yet communicating on this VLAN, the BIG-IP incorrectly assumes there is a hardware or cabling failure and forces a failover to ensure the standby device (which might have better connectivity) takes over. To prevent this unwanted failover, the administrator should uncheck the Fail-safe box for that specific VLAN until the VLAN is fully populated with active nodes and regular traffic. Once the application is live and traffic is flowing, Fail-safe can be re-enabled to provide an additional layer of redundancy. Auto Last Hop (Option A) and Source Check (Option B) are routing and security features that do not trigger HA failover events.

質問 # 51
Refer to the exhibit.

DNS queries from two internal DNS servers are being load balanced to external DNS servers via a Virtual Server on a BIG-IP device. The DNS queries originate from 192.168.101.100 and 192.168.101.200 and target
192.168.21.50 .
All DNS queries destined for the external DNS servers fail.
Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?

A. Protocol to UDP
B. Type to Performance (HTTP)
C. Protocol Profile (Client) to DNS-OPTIMIZED
D. Source Address to 192.168.101.0/24

正解：A

解説：
The virtual server is configured for destination 192.168.21.50 , service port 53 , but its Protocol is TCP .
Standard DNS query traffic is normally sent using UDP port 53 . Because virtual-server traffic matching includes the configured IP protocol, UDP DNS packets will not match a virtual server configured exclusively for TCP, causing the queries to fail.
F5 ' s DNS configuration guidance explicitly instructs administrators creating a DNS query virtual server to configure service port 53 and select UDP as the protocol. F5 also recommends separate TCP and UDP virtual servers when both forms of DNS traffic must be supported; TCP port 53 is particularly relevant for operations such as DNS zone transfers.
Option C is not required. The existing source network 192.168.100.0/23 spans addresses from 192.168.100.0 through 192.168.101.255, so both 192.168.101.100 and 192.168.101.200 are already permitted by the source- address criterion. F5 documents that the Source Address setting can specify the network from which a virtual server accepts traffic.
Therefore, changing the virtual server ' s Protocol from TCP to UDP corrects the traffic-matching problem.
Reference Topics: Virtual Server traffic matching; Protocol selection; DNS over UDP/TCP; Source Address matching; Service Port 53.

質問 # 52
......

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